package top.lishuoboy.javaweb.a09el_jstl; /**
 * @author lishuoboy
 * @date 2022-01-07 00:52
 */

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

@Slf4j
@WebServlet(name = "FileUploadServlet", value = "/FileUploadServlet")
public class FileUploadServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse response) throws ServletException, IOException {
//        System.out.println(IoUtil.read(req.getInputStream(), CharsetUtil.CHARSET_UTF_8));
//        System.out.println(req.getParameter("name"));  // 原生拿不到参数了，因为 enctype="multipart/form-data"
//        System.out.println(req.getParameter("photo")); // 原生拿不到参数了，因为 enctype="multipart/form-data"

        //1 先判断上传的数据是否多段数据（只有是多段的数据，才是文件上传的）
        if (ServletFileUpload.isMultipartContent(req)) {
//           创建FileItemFactory工厂实现类
            FileItemFactory fileItemFactory = new DiskFileItemFactory();
            // 创建用于解析上传数据的工具类ServletFileUpload类
            ServletFileUpload servletFileUpload = new ServletFileUpload(fileItemFactory);
            try {
                // 解析上传的数据，得到每一个表单项FileItem
                List<FileItem> list = servletFileUpload.parseRequest(req);
                // 循环判断，每一个表单项，是普通类型，还是上传的文件
                for (FileItem fileItem : list) {
                    if (fileItem.isFormField()) { // 普通表单项
                        // 参数UTF-8.解决乱码问题
                        log.info("{}=={}", fileItem.getFieldName(), fileItem.getString("UTF-8"));

                    } else {  // 文件表单项
                        System.out.println("表单项的name属性值：" + fileItem.getFieldName());
                        System.out.println("上传的文件名：" + fileItem.getName());
                        System.out.println("上传的文件名内容：" + fileItem.getString("UTF-8"));

                        fileItem.write(new File("D:\\tmp\\" + fileItem.getName()));
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }
}
